//import 'babel-polyfill'

let fun = (a, b)=>a * b;

let arr = [1, 3, 7, 9];
let arrN = arr.map(item=>item * 2);


if (arr.includes(9)) {
    console.log(9);
} else {
    console.log('0');
}

function* ffn() {

}

console.log('new Set(arrN)=:', new Set(arrN));
console.log(arrN);

